Primele is the creative design studio of sisters Patricia, Rachel, and Kim Mumau. I came across their work quite a while ago while looking into wedding invitation designs for one of my friends. Calligraphy is one thing, but the design and placement of the words and filigree on envelopes, prints, stamps, etc. makes the ordinary look crazy beautiful. I love that the lettering has a natural and organic feel (opposed to script fonts, for example) but still keeps the information clean and special.
Also check out their new stationery line Fawnsberg – which is stocked with gorgeous floral designs, notecards, writing sheets, and more stamps for making snail mail stand out.